v0.42.0

In this release

• 13 new lints, for a total of 177
• Spotlight: #[target_feature] lints
• Bugfix: false-positive sealed trait lints

This release requires Rust 1.85+ both to install (MSRV) and at runtime. Future releases will require Rust 1.87+.

Spotlight: #[target_feature] lints

Check out this in-depth look at the SemVer and soundness surprises behind this attribute:
Unsoundness and accidental features in the #[target_feature] attribute

New lints

We added new 13 lints across several categories, including 12 lints around #[target_feature] and one lint about an additive-only change. Some of the new lints are error-by-default, while others are warnings meant to flag changes deserving closer review, or even opt-in only and disabled by default while we do more work to improve their user experience.

API breakage:

• safe_function_requires_more_target_features
• safe_function_target_feature_added
• safe_inherent_method_requires_more_target_features
• safe_inherent_method_target_feature_added
• trait_method_target_feature_removed
• unsafe_function_requires_more_target_features
• unsafe_function_target_feature_added
• unsafe_inherent_method_requires_more_target_features
• unsafe_inherent_method_target_feature_added
• unsafe_trait_method_requires_more_target_features
• unsafe_trait_method_target_feature_added
• pub_api_sealed_trait_method_target_feature_removed (warn-by-default)

Additive-only API changes (opt-in only; more work required):

• exhaustive_enum_added

All merged PRs

• Update FAQ section on MSRV policy. by @obi1kenobi in #1258
• Weekly cargo update of dependencies by @obi1kenobi in #1259
• feat: check for minimum possible semver bump by @Frank-III in #1237
• Weekly cargo update of dependencies by @obi1kenobi in #1261
• Drop support for Rust 1.84. New MSRV is 1.85. by @obi1kenobi in #1257
• Weekly cargo update of dependencies by @obi1kenobi in #1264
• Add next Rust minor to test matrix by @obi1kenobi in #1266
• Weekly cargo update of dependencies by @obi1kenobi in #1270
• Weekly cargo update of dependencies by @obi1kenobi in #1273
• Weekly cargo update of dependencies by @obi1kenobi in #1277
• Fix error message when registry version is not found. by @obi1kenobi in #1280
• [Witness Generation] Add unstable witness program flag by @GlitchlessCode in #1276
• Add support for rustdoc JSON format v46. by @obi1kenobi in #1282
• Weekly cargo update of dependencies by @obi1kenobi in #1284
• Upgrade tame-index and gix by @kornelski in #1287
• Don't change current_dir when running cargo by @kornelski in #1290
• Collect crates before running reports by @kornelski in #1289
• Weekly cargo update of dependencies by @obi1kenobi in #1294
• Update to trustfall_rustdoc version w/ #[target_feature] data. by @obi1kenobi in #1295
• Enable environment variable overrides for git repo discovery by @PigeonF in #1269
• Touch up the README. by @obi1kenobi in #1296
• Fix doc comment formatting by @obi1kenobi in #1298
• Fix color choice for stderr by @obi1kenobi in #1299
• Fix typo in CONTRIBUTING by @obi1kenobi in #1300
• Add exhaustive_enum_added lint. by @shreyans413 in #1189
• Add conflict checks for current_rustdoc by @obi1kenobi in #1301
• Add unsafe_function_target_feature_added lint by @obi1kenobi in #1302
• Add scripts and CI job for prebuilt test rustdocs by @obi1kenobi in #1305
• Add unsafe_trait_method_target_feature_added lint by @obi1kenobi in #1304
• Update CI matrix updater by @obi1kenobi in #1308
• Fix artifact retrieval by @obi1kenobi in #1310
• Add workflow to automate snapshot updates by @obi1kenobi in #1309
• Add lint for inherent methods gaining target features by @obi1kenobi in #1311
• Fix the download_prebuilt_test_rustdocs.sh script download logic. by @obi1kenobi in #1312
• Remove stray set -x in the downloader script. by @obi1kenobi in #1313
• Weekly cargo update of dependencies by @obi1kenobi in #1314
• Add function_requires_more_target_features lint by @obi1kenobi in #1316
• Add trait_method_requires_more_target_features lint by @obi1kenobi in #1315
• Fix Handlebars repeat helper context cleanup by @obi1kenobi in #1317
• Fix typo in test rustdocs downloader. by @obi1kenobi in #1318
• Fix cache settings None case by @obi1kenobi in #1319
• Save downloaded rustdoc JSONs artifact to disk. by @obi1kenobi in #1320
• Use artifacts for CI binaries by @obi1kenobi in #1321
• Rename lint and test crate with unsafe prefix by @obi1kenobi in #1323
• Rename trait_method_requires_more_target_features lint by @obi1kenobi in #1325
• Rename function target feature lint to unsafe variant by @obi1kenobi in #1324
• Add lint rename helper by @obi1kenobi in #1326
• Fixes for unsafe_function_requires_more_target_features by @obi1kenobi in #1328
• Fix edge cases in unsafe_inherent_method_requires_more_target_features by @obi1kenobi in #1327
• Fixes for "unsafe became safe" for remaining feature-related lints. by @obi1kenobi in #1329
• Add safe_function_target_feature_added lint by @obi1kenobi in #1303
• Add safe_inherent_method_target_feature_added lint by @obi1kenobi in #1306
• Add unsafe_inherent_method_target_feature_added lint by @obi1kenobi in #1307
• [Witness Generation] Add InheritedValue inheritance by @GlitchlessCode in #1330
• Update trustfall_rustdoc to support rustdoc v48 and drop v46. by @obi1kenobi in #1331
• Add safe_inherent_method_requires_more_target_features lint by @obi1kenobi in #1333
• Add safe_function_requires_more_target_features lint by @obi1kenobi in #1332
• Reset mtimes and output user-facing messages in rustdoc downloader. by @obi1kenobi in #1335
• Parallelize rustdoc regeneration script by @obi1kenobi in #1322
• Add user-agent string to curl of crates.io API. by @obi1kenobi in #1336
• Add trait_method_target_feature_removed lint by @obi1kenobi in #1337
• Parallelize metadata generation by @obi1kenobi in #1338
• Add pub_api_sealed_trait_method_target_feature_removed lint. by @obi1kenobi in #1339
• Weekly cargo update of dependencies by @obi1kenobi in #1340
• Use trustfall_rustdoc v0.27 supporting the latest beta's rustdoc. by @obi1kenobi in #1343
• Fix lint to latest stable Rust's standard. by @obi1kenobi in #1347
• Fix more linty code. by @obi1kenobi in #1348
• Add next Rust minor to test matrix by @obi1kenobi in #1345
• [Witness Generation] Update InheritedValue key to an Arc<str> by @GlitchlessCode in #1349
• If a #[target_feature] fn was never callable on a triple, don't lint on it. by @obi1kenobi in #1350
• [Witness Generation] Add witness query system & witness text generation by @GlitchlessCode in #1342
• Weekly cargo update of dependencies by @obi1kenobi in #1351
• Weekly cargo update of dependencies by @obi1kenobi in #1357
• Release v0.42.0. by @obi1kenobi in #1358

New Contributors

• @kornelski made their first contribution in #1287
• @PigeonF made their first contribution in #1269

Full Changelog: v0.41.0...v0.42.0